Rated 4 out of 5 stars

probably my favorite add-on
still there is a bug somewhere that tormented me a lot : https://support.mozilla.com/en-US/questions/874485#answer-247178
see last step to reproduce - not necessary to have dropbox - just copy the profile folder to a new machine (with same version of firefox)
if mot a problem with autocopy then there is a bug in FF - let me know

This review is for a previous version of the add-on (1.0.1).